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The royal was implicated in the Ripper killings in 1970 by British Physician Dr Thomas Stowell.

The Prince's letters - being sold by British collector - are expected to fetch £3,000 in a sale by International Autograph Auctions.

Auctioneer Richard Davie, from Nottingham, said: "These must be the first documents ever to reveal a member of the Royal Family had contracted a sexually transmitted disease, most probably from a prostitute .

"This would today be regarded as a scandal worthy of tabloid newspaper coverage.

Covered up: Prince Albert Victor's have only just be revealed (Photo: Getty)

"But when you add in the mystery and intrigue surrounding Prince Albert Victor's connection with the Jack the Ripper enquiry then these letters become even more significant and interesting.

"I'm no legal expert, but a written document that would appear to back up a motive for a murder suspect would be worthy of closer scrutiny by investigating police officers today.

"It makes you wonder what the likes of Frederick Abberline and his team of detectives working on the Jack the Ripper case at the time would have made of these letters."

But crime historian Dr Jan Bonderson, author of "The True History of Jack the Ripper" said: "Prince Albert Victor was implicated in the Ripper murders and has been regarded as a suspect but that has been discarded.

"He he didn't fit the description for Jack who was meant to have been an ordinary Joe, not a member of the aristocracy.

"Besides, Prince Albert was in Scotland at the time of one of the murders. OK, so he had gonorrhoea at the time but so did most men who visited prostitutes.